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KolibriOS (also known as KOS and Kolibri) is a free operating system with a monolithic preemptive, real-time kernel, video drivers, for 32-bit x86 architecture computers, developed and maintained by The KolibriOS Project Team. KolibriOS is a fork of MenuetOS, written entirely in FASM (assembly language). However, C–, C, C++, Free Pascal, Forth, among other high-level languages and compilers, can also be used in user application development. KolibriOS is available in English, Russian and German.


  • Boots from several devices.
  • Graphical user interface based on VESA.
  • Development kit: code editor with a macro-assembler (FASM) integrated
  • TCP/IP stack
  • Fits on a single 1.44MB floppy (many applications are compressed).
  • Pre-emptive multitasking, streams, parallel execution of system calls.
  • Supported file systems are FAT12, FAT16, FAT32 (long names support), NTFS (read only), ISO 9660 (including multisession).
  • AC’97 audio codec support for Intel, nForce, nForce2, nForce3, nForce4 and SIS7012 chipsets.
  • CD and DVD support.
  • USB support (uhci controller).
  • User can change themes directly in the OS.

Command-line interpreter

CMD is a command-line interpreter that functions as a command line (shell). The current version is 0.26.

The following is a list of the available commands:

  • Application management and processes (kill, ps)
  • Dealing with the file system (cp, ls, del, rn, …)
  • Other commands such as cls, ver, exit, shutdown, help, pause, echo, ends.



KolibriOS wiki (russian language)

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